Why declaring Jerusalem as the capital of Israel is so controversial

Jerusalem (CNN)US President Donald Trump is expected to declare Jerusalem as the capital of Israel this week in a move that will spark controversy across the world. The announcement would move Trump one step closer to fulfilling his campaign pledge to relocate the US embassy from Tel Aviv to Jerusalem -- a move long sought by Israel, but set aside by previous US Presidents due to regional concerns and Jerusalem's contested status between Israelis and Palestinians. Both sides claim the holy city as their capital.Upon making his decision public, Trump is expected to sign a waiver to keep the US embassy in Tel Aviv for another six months. But the State Department's security arm has been told to plan for potentially violent protests at US emba ...